Various techniques have been applied to center pillar to enhance collision characteristics during side crash. Among these techniques, the patchwork (PW) was welded to center pillar to strengthen the stiffness and partial softening (PS) was applied to provide ductility. Side crash test was conducted by Insurance Institute for Highway Safety (IIHS) to evaluate collision resistance. But it is hard to evaluate collision toughness and energy distribution flow for each automobile component. In this study, the side crash simulation was performed along with IIHS instruction. The effect of Hot Press Forming (HPF) center pillar with the combination techniques of PW and PS on collision toughness and energy distribution flow was investigated. As a results, the role of PW and PS techniques were verified during side crash. The strain energy and intrusion displacement by PW were improved 10, 7.5% respectively and the plastic deformation energy and intrusion displacement by PS were improved 10%. When PW and PS were applied to the HPF center pillar simultaneously, the synergy effect of PW and PS occurred.